<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="http://oss.sheetjs.com/js-xlsx/xlsx.full.min.js"></script>
</head>

<body>
    <input type="file" onchange="importf(this)" />
    <div id="demo"></div>
    <script>
        /*
           FileReader共有4种读取方法：
           1.readAsArrayBuffer(file)：将文件读取为ArrayBuffer。
           2.readAsBinaryString(file)：将文件读取为二进制字符串
           3.readAsDataURL(file)：将文件读取为Data URL
           4.readAsText(file, [encoding])：将文件读取为文本，encoding缺省值为'UTF-8'
                        */
        var wb;//读取完成的数据
        var rABS = false; //是否将文件读取为二进制字符串

        function importf(obj) {
            if (!obj.files) {
                return;
            }
            var f = obj.files[0];
            var reader = new FileReader();
            reader.onload = function (e) {
                var data = e.target.result;
                if (rABS) {
                    wb = XLSX.read(btoa(fixdata(data)), {//手动转化
                        type: 'base64'
                    });
                } else {
                    wb = XLSX.read(data, {
                        type: 'binary'
                    });
                }
                document.getElementById("demo").innerHTML = JSON.stringify(XLSX.utils.sheet_to_json(wb.Sheets[wb.SheetNames[0]]));
            }
            if (rABS) {
                reader.readAsArrayBuffer(f);
            } else {
                reader.readAsBinaryString(f);
            }
        }

        function fixdata(data) { //文件流转BinaryString
            var o = "",
                l = 0,
                w = 10240;
            for (; l < data.byteLength / w; ++l) o += String.fromCharCode.apply(null, new Uint8Array(data.slice(l * w, l * w + w)));
            o += String.fromCharCode.apply(null, new Uint8Array(data.slice(l * w)));
            return o;
        }

    </script>
</body>

</html>